<template>
  <div class="cart">
    <h4>全部商品</h4>
    <div class="cart-main">
      <div class="cart-th">
        <div class="cart-th1">全部</div>
        <div class="cart-th2">商品</div>
        <div class="cart-th3">单价（元）</div>
        <div class="cart-th4">数量</div>
        <div class="cart-th5">小计（元）</div>
        <div class="cart-th6">操作</div>
      </div>
      <div class="cart-body" v-show="cart.length">
        <ul class="cart-list" v-for="c in cart" :key="c.skuid">
          <li class="cart-list-con1">
            <input
              type="checkbox"
              name="chk_list"
              :checked="c.isChecked"
              @click="changeOneCart(c)"
            />
          </li>
          <li class="cart-list-con2">
            <img :src="c.imgUrl" />
            <div class="item-msg">{{ c.skuName }}</div>
          </li>
          <li class="cart-list-con4">
            <span class="price">{{ c.skuPrice }}</span>
          </li>
          <li class="cart-list-con5">
            <a @click="changeNum('decre', c)" class="mins">-</a>
            <input
              :value="c.skuNum"
              @change="changeNum('input', c, $event)"
              autocomplete="off"
              type="text"
              value="1"
              minnum="1"
              class="itxt"
            />
            <a @click="changeNum('incre', c)" class="plus">+</a>
          </li>
          <li class="cart-list-con6">
            <span class="sum">{{ c.skuNum * c.skuPrice }}</span>
          </li>
          <li class="cart-list-con7">
            <a @click="deleteOne(c.skuId)" class="sindelet">删除</a>
            <br />
          </li>
        </ul>
      </div>
    </div>
    <div class="cart-tool" v-show="cart.length">
      <div class="select-all">
        <input
          class="chooseAll"
          type="checkbox"
          :checked="isAll"
          @click="changeCarts"
        />
        <span>全选</span>
      </div>
      <div class="option">
        <a @click="deleteChecked()">删除选中的商品</a>
      </div>
      <div class="money-box">
        <div class="chosed">
          已选择 <span>{{ total }}</span
          >件商品
        </div>
        <div class="sumprice">
          <em>总价（不含运费） ：</em>
          <i class="summoney">{{ totalPrice }}</i>
        </div>
        <div class="sumbtn">
          <router-link class="sum-btn" to="/trade">结算</router-link>
        </div>
      </div>
    </div>

    <div class="empty" v-show="!cart.length">
      <h2>购物车空空如也！</h2>
      <img src="http://49.232.112.44/img/empty.751bed26.gif" alt="" />
    </div>
  </div>
</template>

<script>
import {
  ReqCartList,
  ReqOnecheckCart,
  ReqbatchCheckCart,
  ReqdeleteCart,
  ReqbatchDeleteCart,
  ReqaddToCart,
} from "@/api";
import { goodsNumReg } from "@/utils";
import _ from "lodash"
export default {
  name: "ShopCart",
  data() {
    return {
      cart: [],
    };
  },
  computed: {
    // 用户标识是否全选
    isAll() {
      return this.cart.every((item) => item.isChecked === 1);
    },
    // 总数
    total() {
      let n = 0;
      this.cart.forEach((item) => {
        if (item.isChecked) {
          n += item.skuNum;
        }
      });
      return n;
    },
    // 总价
    totalPrice() {
      let price = 0;
      this.cart.forEach((item) => {
        if (item.isChecked) {
          price += item.skuNum * item.skuPrice;
        }
      });
      return price;
    },
  },
  methods: {
    async getCartList() {
      // 向后台发送请求获取购物车数据
      let data = await ReqCartList();
      // console.log(data);
      // 向data赋值数据
      this.cart = data[0].cartInfoList;
    },
    // 控制商品的购买与不购买状态
    async changeOneCart(c) {
      // 获取商品的编号、当前的勾选状态
      let { skuId, isChecked } = c;
      // 定义一个新的购买状态
      let newChecked = isChecked === 1 ? 0 : 1;
      // 向后台发送请求
      await ReqOnecheckCart(skuId, newChecked);
      // console.log(data);
      // 同步更新本地的勾选状态
      c.isChecked = newChecked;
    },
    // 控制商品的全选与全不选
    async changeCarts(e) {
      // 获取 多选框的 当前的 状态
      let { checked } = e.target;
      // 对状态 进行处理
      let isChecked = checked ? "1" : "0";
      // 对数组进行处理
      let skuIdList = this.cart.map((item) => item.skuId);
      // 发送请求
      await ReqbatchCheckCart(isChecked, skuIdList);
      // this.getCartList();
      // 同步更新本地的  所有商品的 选中状态
      this.cart.forEach((item) => (item.isChecked = isChecked * 1));
    },
    // 删除单个商品
    async deleteOne(skuId) {
      if (confirm("确认删除吗？")) {
        // 向后台发送请求 删除某个商品
        await ReqdeleteCart(skuId);
        // 更新本地的商品
        let index = this.cart.findIndex((item) => item.skuId === skuId);
        // console.log(index);
        this.cart.splice(index, 1);
      }
    },
    // 删除多个商品
    async deleteChecked() {
      if (confirm("确认删除选中的商品吗？")) {
        // 准备选中的 商品 的 skuIdList
        let skuIdList = [];
        this.cart.forEach((item) => {
          if (item.isChecked === 1) {
            // 将数据新增到skuIdList
            skuIdList.push(item.skuId);
          }
        });

        // 1、向后台发送去请求  删除多个商品
        await ReqbatchDeleteCart(skuIdList);

        // 2、同步删除多个商品
        // 过滤出不包含skuId的这些数据
        this.cart = this.cart.filter((item) => {
          return !skuIdList.includes(item.skuId);
        });
      }
    },
    // 更新购物车商品的数量
    async changeNum(type, c, e) {
      // 获取商品的id 和数量
      let { skuId, skuNum } = c;
      // 创建锁 undefined 是false
      this.isLock;
      // 判断
      if (this.isLock) return;
      switch (type) {
        case "input":
        this.isLock = true;
          // 获取当前用户所输入的数量
          let { value } = e.target;
          // 符合数字条件验证
          if (goodsNumReg.test(value)) {
            // 计算插值
            let distNum = value - skuNum;
            // console.log('当前id是',skuId);
            // console.log('当前数量是',skuNum);
            // console.log('当前插值是',distNum);
            // console.log('用户输入的数量是',value);

            // 向后台发送请求 更新商品数量
            await ReqaddToCart(skuId, distNum);
            // 改变当前数据的 skuNum 和 isChecked
            c.skuNum = parseInt(value);
            c.isChecked = 1;
          } else if (value > 200) {
            // 大于 200 应该重置为200
            // 并且重新发送请求
            // 重新计算差值
            let distNum = 200 - skuNum;

            // 向后台发送请求，更新商品数量
            await ReqaddToCart(skuId, distNum);
            // 将数据本地数据变为 200,并isChecked
            c.skuNum = e.target.value = 200;
            c.isChecked = 1;
          } else {
            // 不符合条件验证
            // 当用户输入 字母 汉子 负数 小数的时候 重置为当前的数量
            e.target.value = skuNum;
          }
          break;
        case "incre":
        this.isLock = true;
          if (c.skuNum < 200) {
            // 向后台发送请求，更新商品数量
            await ReqaddToCart(skuId, 1);
            // 更新本地的数据
            c.skuNum += 1;
            c.isChecked = 1;
          }
          break;
        case "decre":
        this.isLock = true;
          if (c.skuNum > 1) {
            // 向后台发送请求，更新商品数量
            await ReqaddToCart(skuId, -1);
            // 更新本地的数据
            c.skuNum -= 1;
            c.isChecked = 1;
            break;
          }
      }
      this.isLock = false
    },
  },
  mounted() {
    // 调用方法
    this.getCartList();
  },
};
</script>

<style lang="less" scoped>
.cart {
  width: 1200px;
  margin: 0 auto;
  h4 {
    margin: 9px 0;
    font-size: 14px;
    line-height: 21px;
  }
  .cart-main {
    .cart-th {
      background: #f5f5f5;
      border: 1px solid #ddd;
      padding: 10px;
      overflow: hidden;
      & > div {
        float: left;
      }
      .cart-th1 {
        width: 25%;
        input {
          vertical-align: middle;
        }
        span {
          vertical-align: middle;
        }
      }
      .cart-th2 {
        width: 25%;
      }
      .cart-th3,
      .cart-th4,
      .cart-th5,
      .cart-th6 {
        width: 12.5%;
      }
    }
    .cart-body {
      margin: 15px 0;
      border: 1px solid #ddd;
      .cart-list {
        padding: 10px;
        border-bottom: 1px solid #ddd;
        overflow: hidden;
        & > li {
          float: left;
        }
        .cart-list-con1 {
          width: 15%;
        }
        .cart-list-con2 {
          width: 35%;
          img {
            width: 82px;
            height: 82px;
            float: left;
          }
          .item-msg {
            float: left;
            width: 150px;
            margin: 0 10px;
            line-height: 18px;
          }
        }
        .cart-list-con4 {
          width: 10%;
        }
        .cart-list-con5 {
          width: 17%;
          .mins {
            border: 1px solid #ddd;
            border-right: 0;
            float: left;
            color: #666;
            width: 6px;
            text-align: center;
            padding: 8px;
            text-decoration: none;
          }
          input {
            border: 1px solid #ddd;
            width: 40px;
            height: 31px;
            float: left;
            text-align: center;
            font-size: 14px;
          }

          .plus {
            border: 1px solid #ddd;
            border-left: 0;
            float: left;
            color: #666;
            width: 6px;
            text-align: center;
            padding: 8px;
            text-decoration: none;
          }
        }

        .cart-list-con6 {
          width: 10%;

          .sum {
            font-size: 16px;
          }
        }

        .cart-list-con7 {
          width: 13%;

          a {
            color: #666;
          }
        }
      }
    }
  }
  .cart-tool {
    overflow: hidden;
    border: 1px solid #ddd;

    .select-all {
      padding: 10px;
      overflow: hidden;
      float: left;

      span {
        vertical-align: middle;
      }

      input {
        vertical-align: middle;
      }
    }

    .option {
      padding: 10px;
      overflow: hidden;
      float: left;

      a {
        float: left;
        padding: 0 10px;
        color: #666;
      }
    }

    .money-box {
      float: right;

      .chosed {
        line-height: 26px;
        float: left;
        padding: 0 10px;
      }

      .sumprice {
        width: 200px;
        line-height: 22px;
        float: left;
        padding: 0 10px;

        .summoney {
          color: #c81623;
          font-size: 16px;
        }
      }

      .sumbtn {
        float: right;
        a {
          display: block;
          position: relative;
          width: 96px;
          height: 52px;
          line-height: 52px;
          color: #fff;
          text-align: center;
          font-size: 18px;
          font-family: "Microsoft YaHei";
          background: #e1251b;
          overflow: hidden;
          text-decoration: none;
          &hover {
            color: white !important;
          }
        }
      }
    }
  }
  .empty {
    text-align: center;
    img {
      width: 300px;
    }
    h2 {
      color: darkgray;
    }
  }
}
</style>
